1. where are these rules written
Concerning good storytelling, there is a few good books about it. I suggest you read the ones of script doctors like John Truby or Robert McKee.. Those are two of the most complete "gourou" of storytelling. Their voice makes quite a consensus concerning conflict and character development.
2. where Oda says that he blindly follows them.
Now, you have to understand that Rules can be broken, but that must happen only in specific situations. The thing is: Oda is an amazing writer, but most of the time he use classic rules of storytelling. It's rare for him to break good storytelling rules. (Except when it comes to his main protagonists and his structure)
That can be said through an analysis of his works for example:
- The way Oda uses Milking
- The way Oda uses forshadowings
- The way Oda creates good stories.
Etc.
All of that is quantifiable, I can say - for example - when Oda makes a mistakes or a slipup.
Let me give you an example.
You may have noticed that the miracle medecine of the Mink felt a little "Off". Well the reasonnable assumption is that Oda didn't have the fight of Zoro in mind while creating Zou and/or Wano. So when Oda had to make Zoro wake up and fight again.. Well.. he was stuck. He had no other choice but to introduce some kind of miracle medecine.
Problem: Because of the lack of setup for that medecine , it's introduction felt like a deus ex machina.
Strangely, that's something Oda does very rarely. This is the one big mistake he made in Wano concerning his foreshadowings..
All of that to say what..
Well, Rules are here for a reason. Something as important as a miracle medecine MUST be introduced early, if not.. the quality of the revelation drops. In fact there was a good way to introduce that technique: Chapter 959, during the discussion between the strawhats and the mink. A simple "The Sulong is not or only "asset" would have done the job. It would have created an expectation for something, without even sayin what it was.. creating a great revelation at the end line.
The case of King is similar, but this time it touches the status of the character.
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Nop lol, google image.